Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 14, Issue 5, Pages 3019-3028Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ee03947k
Keywords
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Funding
- National Natural Science Foundation of China [21971008, 21971002, 21801015]
- Beijing Institute of Technology Research Fund Program for Young Scholars [3090012221909]
- Shanghai Synchrotron Radiation Facility (SSRF) [BL14W1]
- Beijing Synchrotron Radiation Facility (BSRF) [1W1B]
- National Synchrotron Radiation Laboratory (NSRL) [BL12B, BL11U]
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A highly active CO2RR catalyst, Co-N-Ni/NPCNSs, with N-bridged Co-N-Ni bimetallic sites has been reported. The N-bridged sites were confirmed to promote the formation of COOH* intermediates, thereby accelerating CO2RR. The catalyst showed significantly higher activity and efficiency compared to single Co-N-4 and Ni-N-4 sites.
The electrochemical CO2 reduction reaction (CO2RR) is of importance for reducing global CO2 emissions. Herein, we reported a highly active CO2RR catalyst, namely Co-N-Ni/NPCNSs, which is considered as an advanced single-site catalyst with Co-N-Ni bimetallic sites connected by a N bridge between Co and Ni. The N-bridged Co-N-Ni bimetallic sites were confirmed by the X-ray absorption spectroscopy. The Co-N-Ni/NPCNSs catalyst shows a higher turnover frequency of 2049 h(-1) at a low overpotential of 370 mV and CO faradaic efficiency of 96.4% compared to that of Co-N/NPCNSs (1205 h(-1) and 61.5%) and Ni-N/NPCNSs (404 h(-1) and 45.0%) with single Co-N-4 and Ni-N-4 sites, respectively. In situ synchrotron radiation Fourier transform infrared spectra and DFT calculations show that N-bridged Co-N-Ni bimetallic sites promote the formation of COOH* intermediates, thus accelerating CO2RR.
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